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Finding the Fourth Proportional to 1,005.07, 1,507.61 and 274.65

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Solution

The fourth proportional to 1,005.07, 1,507.61 and 274.65 is: 411.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.07 : 1,507.61 = 274.65 : x
  2. Step 2: Convert to fraction form
    1,005.07/1,507.61 = 274.65/x
  3. Step 3: Cross multiply
    1,005.07x = 1,507.61 × 274.65
  4. Step 4: Simplify right side
    1,005.07x = 414,069.88
  5. Step 5: Solve for x
    x = 414,069.88/1,005.07
  6. Step 6: Final answer
    x = 411.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.